The Left is going after Rush Limbaugh, Clarence Thomas, General Petraeus, Bill O'Reilly and a thousand others with both barrels. Nobody should be surprised: purges are so much a part of their ideology that they may as well be part of the Left's DNA.
There has never been a Leftist organization that didn't feature a good, old-fashioned purge. In fact, they are usually a recurring thing, happening whenever someone new takes (or is trying to take) power. Real elections and the orderly transfer of power doesn't work in a Leftist society. You have to murder (sometimes figuratively but, more often, literally) your rival political enemies. If they thought they could get away with it, those on the Left would have already put all of those mentioned above up against the wall and shot them.
Leftist "revolutions" always start with the purging of those who are not on the Left (they eventually begin infighting and killing other Leftists with differing viewpoints, but that's another post). The lucky ones are sent to "re-education camps" where they are tortured and brutalized. The not-so-lucky ones are murdered outright because their ideas and their stature threaten the Leftists. Truth and ideas are just as threatening to the Left as guns and soldiers.
Make no mistake: Harry Reid, Nancy Pelosi, Hillary Clinton, Noam Chomsky, and the rest of the cold, dead-eyed, hate-filled Leftists in positions of power are exactly the kind of people who have ordered such purges* in the past. And the mindless, shrieking, hysterical dolts who follow them (you can see them at any anti-war protest) are exactly the kind of people who carried out those orders.
What would be frightening if I thought that it were true, is that many of these people apparently believe that we are on the verge of a new "revolution". They mistake the volume of their howling for actual numbers. They make so much noise that they seem to honestly believe that the entire country (other than the Conservatives, of course - you can't have a revolution without a demon to blame all troubles on) is howling along with them. Another thing about Leftists is that they never learn from history. Eventually, as in the 1960's and 70's, they will go too far and they will find that the American people are anything but on their side. We will run out of tolerance and patience and marginalize them into even more complete irrelevance just as we did 30 years ago.
But a large portion of them do believe that their lust for power over others is about to be satisfied. They have control of Congress and believe that the White House is theirs for the taking. And that is why they are attacking their enemies with even more visciousness and lying than usual (and you didn't think that it was possible!). They're gleefully warming up for the inevitable purge.
*That link is from The National Review, April 1977 - 2 years after we had left Vietnam. If you need a refresher on what happened after we surrendered (or "redeployed" as the Democrats like to sweeten it up), it's a great article, as is the website it comes from.